期刊
CELL AND TISSUE RESEARCH
卷 310, 期 3, 页码 349-358出版社
SPRINGER-VERLAG
DOI: 10.1007/s00441-002-0638-4
关键词
interstitial cells of Cajal; fibroblast-like cells; Hirschsprung's disease; pyloric stenosis; potassium channel; mouse; human
类别
The apamin-sensitive component of the inhibitory response of the gastrointestinal musculature involves the small conductance Ca2+-activated K+ channel SK3. Kit-immunoreactive (ir) interstitial cells of Cajal appear to be involved in nitrergic inhibition while the role of the recently described CD34-ir fibroblast-like cells adjacent to, but distinct from, the cells of Cajal remains elusive. The distribution of SK3 was studied by immunohistochemistry in the normal human gut, in motility disorders with a lack of cells of Cajal (infantile hypertrophic pyloric stenosis and Hirschsprung's disease) and in mice deficient in cells of Cajal. SK3 immunoreactivity was observed exclusively in Kit-negative interstitial cells adjacent to, but distinct from, the cells from, the cells of Cajal in the normal gut. The distribution of SK3-ir cells was not altered in conditions where cells of Cajal were lacking. These cells were CD34-ir fibroblast-like cells in the human gut and in the mouse stomach, while SK3-ir cells in the mouse intestine were CD34 negative. As SK channels are reportedly involved in inhibitory neurotransmission, our morphological observations suggest that SK3-ir interstitial cells, distinct from the Kit-ir interstitial cells of Cajal, may represent a novel cellular component in the control of excitability of the digestive musculature. Further studies will be required to directly address the function of these cells.
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